<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <div id="app">
      <div class="houdunren" data="hd">houdunren.com</div>
      <div class="houdunwang">houdunwang.com</div>
    </div>
    <script>
      let app = document.querySelector('#app');
      console.log(app.outerHTML);

      // app.outerHTML = '<h1>后盾人</h1>';
      console.log(app.outerHTML);
    </script>
  </body>
</html>
